题目

The child enjoyed _____ up the wooden bricks then knocking them down.    A. adding    B. pushing    C. piling    D. forming   答案：Cpile up (=lay in a pile or as if in a pile) 把. . . . . . 放成一堆, 堆积：pile up the books on the table (把书堆在桌子上) 。Pile up作不及物动词用, 意为“积压; (若干汽车) 相撞”：1) Perishable goods are piling up at the docks. (码头上易腐烂的货物堆积如山。) 2) Several cars piled up after ignoring the fog warning on the motorway. (由于无视高速During World War II, when London was bombed, many stations f_______ as bomb shelters.